Thrill seekers in New Zealand base jump from an observation deck and plummet 630 feet without a parachute; adrenaline junkies rappel down an ancient mountain in South Africa; a centrifuge in Florida.

Thrill seekers in South Africa let out big screams as they jump off a 288-foot-high catwalk and swing up to 80 mph in a former World Cup stadium; riders take on a roller coaster in Japan that reaches speeds of 95 mph

Longtime friends screech down a record-breaking roller coaster in Ohio, while surfing buddies plunge off the top of the food chain in South Africa; riders thunder down New Zealand's longest river.

Adrenaline junkies whip off a 164-foot-high bridge in New Zealand, spin like a top on a pendulum swing in Canada and fly down a drop that is steeper than steep in Japan.

Friends face their fears on North America's largest zip line; actors brave a coaster in Pennsylvania; thrill seekers bungee jump in the Swiss Alps.

Friends head to Pattaya, Thailand, to bungee jump off a 20-story crane at 70 mph; riders in Missouri take on one of the fastest wooden roller coasters ever built; thrill seekers free fall into a canyon in Colorado.

Friends ride Canada's tallest and fastest roller coaster; soccer mates ride bikes off a ski jump; firefighters go ice-less bobsledding.

Dancers take on a 335-foot-tall tower drop; coworkers become suspended before falling 130 feet; adrenaline junkies swing over a canyon.